US20100189969A1 - Non-fluting printing substrate and method for producing the same - Google Patents

Non-fluting printing substrate and method for producing the same Download PDF

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Publication number
US20100189969A1
US20100189969A1 US12/597,233 US59723308A US2010189969A1 US 20100189969 A1 US20100189969 A1 US 20100189969A1 US 59723308 A US59723308 A US 59723308A US 2010189969 A1 US2010189969 A1 US 2010189969A1
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US
United States
Prior art keywords
printing ink
printed substrate
substrate according
solvent
coating
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Abandoned
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US12/597,233
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English (en)
Inventor
Mikko Oksanen
Tarja Sinkko
Janne Varvemaa
Robert Howell
Martin Thuring
Lars Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UPM Kymmene Oy
Sun Chemical Corp
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UPM Kymmene Oy
Sun Chemical Corp
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Application filed by UPM Kymmene Oy, Sun Chemical Corp filed Critical UPM Kymmene Oy
Priority to US12/597,233 priority Critical patent/US20100189969A1/en
Assigned to UPM-KYMMENE OYJ, SUN CHEMICAL CORPORATION reassignment UPM-KYMMENE OYJ ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KELLER, LARS, OKSANEN, MIKKO, SINKKO, TARJA, VARVEMAA, JANNE, HOWELL, ROBERT, THURING, MARTIN
Publication of US20100189969A1 publication Critical patent/US20100189969A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0023—Digital printing methods characterised by the inks used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/0073—Printed matter of special format or style not otherwise provided for characterised by shape or material of the sheets
    • B42D15/0093—Sheet materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C09D11/033—Printing inks characterised by features other than the chemical nature of the binder characterised by the solvent
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter

Definitions

  • the present invention relates to a printed substrate, and in particular to a printed paper.
  • substrate means to also include, but being not limited to, a paper.
  • the printed substrate comprises at least one coating and a printing ink, formulated as heat-set printing ink.
  • the printing ink has a reduced tack and comprises at least one pigment and a mixture of at least two solvents boiling in the range of from 200° C. to 270° C.
  • coating includes any surface treatment applied to at least one side of the substrate resulting in reduced porosity of the respective surface of the side of the substrate.
  • heat-set offset printing inks including heat-set web offset (HSWO) printing inks
  • HSWO heat-set web offset
  • the particular surface of the unprinted substrate can be achieved, for example but not limited to, by coating the substrate with a coating colour.
  • the porosity of the surface of the unprinted substrate is such that the Gurley-Hill air permeability value of the substrate is above 7000 s/100 ml, preferably above 10000 s/100 ml and most preferably above 12000 s/100 ml.
  • the printed substrate also comprises a non-fluting printing ink being formulated as heat-set printing ink.
  • the printing ink has a reduced tack and comprises at least one pigment and a mixture of at least two solvents boiling in the range of from 200° C. to 270° C. and furthermore is designed to be printed onto the substrate during a heat-set offset printing process, in including, but not limited to, a heat-set web offset (HSWO) printing process.
  • HSWO heat-set web offset
  • the printing process is for achieving inter alia the desired and advantageous effect of considerably less fluting in terms of AFT values being below 0.05%. According to preferred embodiments of the process described according to the present invention gloss and smoothness of the printed substrate are also improved.
  • the present invention also relates to a method of manufacturing the printed substrate by a heat-set offset, including a HSWO printing process.
  • heat-set offset printing in the context of the present invention refers to heat-set offset printing making us of fount solutions that are water-based.
  • heat set offset printing means to include, however is not limited to, HSWO printing.
  • the present invention still further refers to the use of a substrate and a printing ink being formulated as heat-set offset printing ink.
  • the printing ink has a reduced tack and comprises at least one pigment and a mixture of at least two solvents boiling in the range of from 200° C. to 270° C. It furthermore may comprise also a low boiling solvent.
  • the printing ink is designed for producing a printed substrate showing considerably less fluting in terms of AFT values.
  • the printing ink is usually dried in high-temperature ovens.
  • moisture contained in the coated paper evaporates rapidly from non-imaged areas, resulting in considerable shrinkage in the cross direction of the coated paper within this non-imaged area.
  • moisture of the coated paper located underneath an imaged area evaporates rather slowly, since the printing ink layer on the coated paper acts as a barrier to heat transfer and moisture evaporation, resulting in little shrinkage in the cross direction of the coated paper within this imaged area.
  • the non-imaged area of the coated paper compresses the adjoining imaged area in the cross direction during the drying process, leading to buckling of the imaged area.
  • Wood is an inhomogeneous compound of different fibres. These structures are stabilized by chemical bonds. Inside those fibres water molecules act as spacers, increasing fibre dimensions and affecting dimensions of the whole paper web. During the printing process, the fibres pick up more water and swell. In the hot air floatation dryer besides the printing ink, also the paper is dried. The water molecules between/inside the fibres evaporate, allowing the fibres to shrink and to come into close contact with each other. Thereby the paper web shrinks. New chemical bonds are formed between these fibres. Thus the dimensions of the paper are altered.
  • the term “fluting” is defined as undulating creases, waves or bands that form in the printed paper after having passed a heat-set dryer.
  • the corrugations appear in the direction of web travel and are, as mentioned before, more or less permanent, i.e. they do not relax until months after product delivery.
  • U.S. Pat. No. 6,058,844 refers to a method of and an apparatus diminution of fluting or corrugation occurring in printed webs of light weight coated paper printed on both sides with thermosetting printing ink on HMO printing presses.
  • the problem is solved by spreading the web in its width-wise direction as the printed web exits the printing ink drying and heat setting oven of the press and passes over the web cooling chill rolls. Thereby the printed web is held in a flat and smooth condition until it is cooled down and the printing ink takes permanent set. Spreading the web prior to and during cooling allows the printing inks to thermoset in a flat state, because the web is kept flat and free of flutes during thermosetting.
  • the method and apparatus is described to facilitate operation of the press at higher speeds and with lighter grades of paper. However, experience with such devices does not show the indicated advantages.
  • WO 2004/003293 describes a paper having some specific features, with an oleophilic surface of the coating being the most relevant of these features and the gist of that invention.
  • oleophilic substances on the surface of the paper to be printed, like SMA based additives (Raisaprint D100 or Raisaprint D200, see page 5 of WO 2004/003293). They are used to control surface chemistry and to achieve the oleophilic character of the surface. Coating paper with these substances is expensive and therefore not favorable.
  • U.S. Pat. No. 5,713,990 and U.S. Pat. No. 5,875,720 describe printing ink compositions comprising high boiling oils as solvents in the printing ink vehicles. Also, the bodied tung oil described as solvent in U.S. Pat. No. 6,206,960, which is present in the printing ink composition, decomposes only at temperatures greater than 350° C. The drying temperatures suggested during the printing process described in U.S. Pat. No. 6,206,960 are as high as 149° C. U.S. Pat. No. 6,709,503 discloses modified linseed oil as solvent in printing ink compositions, which solvent decomposes only at temperatures greater than 350° C. The drying temperatures during the printing process are described to be high. U.S. Pat. No. 5,427,615 introduces fatty acid ester solvents with high flash points, decomposing only at temperatures above 350° C.
  • U.S. Pat. No. 4,357,164 disclose a printing ink comprising low boiling solvents.
  • U.S. Pat. No. 4,357,164 relates to a waterless lithographic printing process, which does not cornprise the use of a fount solution, i.e. does not give rise to the fluting problem at all.
  • the printed substrate preferably also shows superior gloss and superior smoothness.
  • an improved heat-set offset printing process for obtaining a printed substrate with achieving less fluting is an object of this invention.
  • the invention relates to a printed substrate comprising a substrate and a printing ink-characterized in that at least one side of the substrate has a surface with such porosity that the Gurley-Hill air permeability value of the substrate is above 7000 s/100 ml, and it comprises an printing ink formulated as heat-set offset printing ink with reduced tack comprising at least one pigment and a mixture of at least two solvents boiling in the range of from 200° C. to 270° C.
  • At least on solvent present in the ready-to-use printing ink boils in the range of from 210° C. to 230° C. At least one further solvent being present in the ready-to-use printing ink boils in the range of from 240° C. to 270° C.
  • the mixture of at least two solvents being present in the ready-to-use printing ink comprise solvents that may have different aromatic contents.
  • the pigment present in the ready-to-use printing ink is added in the form of a pigment paste.
  • At least one solvent present in the ready-to-use printing ink has an aromatic content of 1% by weight, based on the solvent, and at least a second solvent being present in the ready-to-use printing ink has an aromatic content of 12% by weight, based on the solvent.
  • at least one solvent being present in the ready-to-use printing ink is a mineral oil solvent.
  • the printed substrate comprises a solvent, which solvent was present in the ready-to-use printing ink in amounts of at least 1% by weight, based on the printing ink composition.
  • All solvents present in the ready-to-use printing ink can be mineral oil solvents.
  • the ready-to-use printing ink comprises a varnish in an amount of from 15 to 30% by weight based on the ready-to-use printing ink.
  • the varnish can comprise at least one self-structured resin.
  • the varnish can be free of gelling agents.
  • the porosity of the substrate surface of the printed substrate according to the invention can be achieved by coating.
  • the coating can comprise a coating colour comprising at least one coating pigment and/or at least one bonding agent.
  • the weight ratio of coating pigment to bonding agent can be in the range of from 1:100 to 100:1.
  • at least one coating pigment is selected from the group consisting of kaolins, talcs, gypsum and carbonates.
  • the amount of the coating pigment can be in the range of from 70 to 90 percent by weight based on the coating colour.
  • the coating pigment can be a plate shaped coating pigment.
  • the particle size distribution of the coating pigment is such that at least 40% by weight of the coating pigment particles are smaller than 2 ⁇ m.
  • the particle size distribution of the coating pigment can be such that at least 25% by weight of the coating pigment particles are smaller than 1 ⁇ m and also can be such that the particle size distribution of the coating pigment is such that at least 10% by weight of the coating pigment particles are smaller than 0.5 ⁇ m.
  • the printed substrate has an AFT value of below 0.05%, preferably below 0.03%.
  • the AFT value is measured on a piece of printed substrate in the dimensions of 27 cm ⁇ 5 cm at standard conditions with an AFT-meter, as set out in more detail below.
  • the invention also refers to a heat-set offset printing process comprising
  • an printing ink formulated as heat-set offset printing ink with reduced tack comprising at least one pigment and a mixture of at least two solvents boiling in the range of from 200° C. to 270° C., and achieving an AFT value of the printed substrate of below 0.05%.
  • said AFT value is measured on a piece of printed substrate in the dimensions of 27 cm ⁇ 5 cm at standard conditions with an AFT-meter.
  • the process according to the invention makes use of an printing ink as described herein, in particular the printing ink comprises as solvents a mixture of at least two solvents comprising solvents having different aromatic contents.
  • the printing ink comprises as solvents a mixture of at least two solvents comprising solvents having different aromatic contents.
  • at least one solvent being present in the ready-to-use printing ink has an aromatic content of 1% by weight, based on the solvent
  • at least a second solvent being present in the ready-to-use printing ink has an aromatic content of 12% by weight, based on the solvent.
  • the porosity of the surface of the substrate used within the process can be achieved by coating.
  • the coating can comprise a coating colour comprising a coating pigment and/or at least one bonding agent.
  • the invention also refers to a use of a substrate with such porosity that the Gurley-Hill air permeability value of the substrate is above 7000 s/100 ml, and a printing ink formulated as heat-set offset printing ink comprising at least one pigment and a mixture of at least two solvents boiling in the range of from 200 to 270° C. for producing a printed substrate.
  • the ready-to-use printing inks as used according to the invention may comprise a mixture of at least two solvents having different aromatic contents. At least one solvent present in the ready-to-use printing inks can have an aromatic content of 1% by weight, based on the solvent, and at least a second solvent present in the ready-to-use printing inks has an aromatic content of 12% by weight, based on the solvent.
  • the printed substrate according to the present invention shows considerably less fluting.
  • the fluting is determined by way of AFT value determination as set out further down below in detail.
  • the term “considerable less fluting” and the term “non-fluting” are herein used synonymously.
  • the highly advantageous and desirable non-fluting characteristics of the printed substrate according to the invention are achieved by making use of a substrate, in particular a paper, having a surface as described herein. Still further the particular printing inks as described before are essential for providing the printed substrate according to the invention. Finally, of course the heat-set printing process in accordance with the invention makes it possible to obtain the printed substrate with the advantageous non-fluting properties.
  • a printed substrate which may include a paper made from a fiber-based raw material, wherein at least one side has a surface with such porosity that the Gurley-Hill air permeability value of the substrate is above 7000 s/100 ml, preferably above 10000 s/100 ml and most preferably above 12000 s/100 ml.
  • Gurley-Hill measurement is based on ISO 5636-5: 2003 standard. The air permeability through substrate is determined, while a higher value (in s/100 ml) corresponds to lower porosity of the sample. The skilled person is well aware of the process of Gurley-Hill measurement and the mentioned respective standard.
  • the printed substrate furthermore comprises a printing ink formulated as heat set printing ink comprising a mixture of at least two solvents, as described above.
  • the fluting of the printed substrate is reduced, i.e. it shows low fluting (non-fluting) properties.
  • the AFT value is reduced more than 40%, preferably more than 50%, compared to the respective AFT value for printed substrate comprising a standard paper and a standard printing ink.
  • non-fluting and low fluting preferably comply with the definition in terms of AFT-values being below 0.05% or even below 0.03%.
  • FIG. 1 illustrates principle of AFT measurement.
  • FIG. 2 shows an apparatus for AFT measurement.
  • the AFT device as shown in FIG. 2 is used by insertion of a sample of printed substrate of certain length and width into the clamps of the AFT device and the shadow pattern which is caused by fluting is observed visually in low angle light.
  • the substrate in particular the paper, is stretched until it becomes totally flat, i.e. until the shadow pattern caused by fluting has disappeared.
  • the elongation of the strip by stretching is measured and is the length B minus length A.
  • the AFT value is the elongation in mm divided by 250 mm (initial length of the sample between the clamps into stretching direction) expressed in percent. For this method the following further parameters were set:
  • Typical AFT values of commercial heat-set offset printed papers are 0.07-0.11% (see example below). A sample is considered non-fluting, if the AFT value is 0.05% or lower. Measurements are done at 23° C. and relative humidity of 50%.
  • Standard paper and standard printing ink in terms of this invention are, for example:
  • Paper Commercially available double coated MWC paper. Grammage: 80 g/m 2 . Gurley-Hill: 3320 s/100 ml. AFT value 0.085% by using standard printing ink and web exit temperature 130° C.
  • Base paper of this commercial MWC paper is a wood containing base paper with a grammage of 45 g/m 2 .
  • the paper is precoated with calcium carbonate coating pigment, binder and additives.
  • Top coating is based on clay and calcium carbonate coating pigment blend, binder and additives.
  • Ink Commercially available heat-set offset printing ink. This printing ink is suited for printing on coated paper especially Light Weight Coated paper (LWC) and Super Calendared (SC) paper.
  • LWC Light Weight Coated paper
  • SC Super Calendared
  • the present invention provides superior printed substrate obtained by a heat-set printing process, in particular HSWO printing process. Using this technique, a very high printing quality with regard to accuracy of the image is achieved. Additionally, the printed substrate can be obtained at favorable costs. Any conventional heat-set offset printing machine can be used in order to prepare the printed substrate of the present invention.
  • coating technologies can be used to obtain two, three, four, five or more surfaces.
  • Such technologies comprise the use of a metering size press, a blade coater with jet applicator, a blade coater with roll applicator, a blade coater with SDTA (short dwell time applicator), a spray coater or curtain coater or the like or any combination of these.
  • the present invention provides superior printed substrate obtained by a heat-set offset printing process. Using this technique, a very high printing quality with regard to accuracy of the image is achieved. Additionally, the printed substrate can be obtained at favorable costs. Any conventional heat-set offset printing machine can be used in order to prepare the printed substrate of the present invention.
  • the invention is specifically based on paper allowing the porosity of the surfaces to be controlled.
  • the paper surface is designed to be dense as defined herein in terms of porosity.
  • the fluting properties of the printed substrate in terms of AFT values are reduced, namely more than 40% reduction, more preferred more than 50% reduction is achieved when compared to the respective values for printed substrate comprising standard paper and standard printing ink, as described before.
  • the non-fluting behaviour of the printed substrate can be achieved by the use of printing inks formulated as heat set offset printing inks comprising a mixture of at least two solvents boiling in the range of from 200° C. to 270° C.
  • at least one solvent which may be a mineral oil has an aromatic content of 1% by weight.
  • suited are also solvents with an aromatic content in the range of from of 0% by weight to 5% by weight, preferably in the range of from 0.5% by weight to 3% by weight.
  • a second solvent which again can be a mineral oil, has an aromatic content of 12% by weight. Nevertheless, suited are also solvents with an aromatic content in the range of from 10% by weight to 18% by weight, preferably 11% by weight to 15% by weight.
  • the mixture of at least two solvents present in the printing ink which solvents may be mineral oils, has an aromatic content in the range of from 6% by weight to 10% by weight, 7% by weight to 9% by weight and most preferred an aromatic content of 8% by weight.
  • Preferred web temperatures in the last zone of the heat-set dryer are between 85° C. and 120° C., more preferred between 90° C. and 110° C. and most preferred between 95° C. and 105° C. Suited drying temperatures are for example 120° C., 110° C., 100° C., 95° C., 90° C. or 85° C.
  • Preferred amounts of low boiling solvents usable within the compositions of the invention are greater than 1% by weight (based on ready to use printing ink compositions), more preferred greater than 5% by weight (based on ready to use printing ink compositions) and in particular of from 10 to 40% by weight (based on ready to use printing ink compositions).
  • the printing inks allow for a particular tack behaviour, which can be caused by the presence of respective varnishes.
  • the varnishes have superior properties, because the above-defined aromatic contents allow for the presence of particular resins (so called self-structured resins) and hence can be designed such that also the tack of the final printing ink is reduced.
  • the tack of the printing inks is reduced.
  • the low tack described herein means that at the tack is at least 10% lower than the tack of known non-fluting heat-set offset printing inks, preferably between 10% and 20% lower, more preferably between 12.5% and 17.5%, most preferably 15% lower.
  • Tack a function of the force required to split a thin fluid film of a printing ink or vehicle between two rapidly separating surfaces; it is a rheological parameter indicative of internal cohesion of the fluid.”
  • Tack of printing inks controls their high speed transfer properties. It may also be meaningful as to the ability to predict paper picking and wet trapping in multi colour printing. Conventional instruments determine the force exerted on a measuring roller that is positioned on the printing ink film of a driving roller.
  • FIG. 3 shows the construction of a traditional three-roller-tackmeter.
  • Tack-o-scope® (Testprint BV, Netherlands.) is used to measure tack.
  • a defined weight of printing ink is placed on a three roller system.
  • the roller system consists of a middle, metallic driving roller, an printing ink distribution roller and a measuring roller for tack determination. These two outer rollers are covered with an elastomer layer. After speed adjustment and temperature stabilization the axial force on the measurement roller is determined. This axial force is used as indication of tack. The higher the axial force, the higher the determined tack number.
  • the moisture gradient i.e. the drying gradient
  • fluting in heat-set printing, in particular in the heat-set web offset printing processes, is significantly reduced or even avoided with the substrate according to the invention.
  • the obtained density makes it possible to minimize the moisture gradient for the substrate. Drying of the non-imaged areas relative to the imaged areas is delayed due to the dense substrate, thereby the moisture gradient is reduced, e.g. in the HSWO drying process. By reducing the moisture gradient, fluting is reduced.
  • substrate refers to any fiber-based paper, cardboard or fiber product, or the like.
  • Paper can be made from chemical pulp, mechanical pulp, chemimechanical pulp, recycled fiber and the like as well as mixtures thereof.
  • the paper can be in the form of a paper web, pressweb, or sheets, or another form appropriate for its purpose.
  • the paper can contain the proper filling and admixing materials.
  • the surface of the base paper [stock] is provided with a coating colour comprising a coating pigment and/or bonding agent [adhesive].
  • a coating colour comprising a coating pigment and/or bonding agent [adhesive].
  • the weight ratio of coating pigment to bonding agent is in the range of from 1:100 to 100:1, more preferably 5:1 to 1:5.
  • the coating pigment is chosen from the group consisting of kaolins, talcs, calcium carbonates, gypsum, their mixtures and similar coating pigments.
  • Preferred coating pigments are kaolins and talcs.
  • coating pigment there are 100 parts of coating pigment present in the coating formulation.
  • the proportion of binder in the composition is typically from 10 to 15 parts, with parts meaning parts per weight.
  • the coating colour comprises a plate-shaped coating pigment, wherein the amount of plate-shaped coating pigment is more than 70 parts, preferably more than 90 parts.
  • the coating colour comprises a spherical coating pigment.
  • the coating colour can comprise a bonding agent.
  • the bonding agent comprises a latex having a glass transition temperature in the range of from ⁇ 30 to 35° C., more preferably in the range of from 0 to 25° C.
  • the glass transition temperature can be determined by Differential Scanning Calorimetry (DSC), which is known for the person skilled in the art.
  • the bonding agent is chosen from the group consisting of starches, proteins, latexes, carboxy-methyl cellulose, polyvinyl alcohol, their mixtures, and the like.
  • Preferred bonding agents are latexes.
  • the porosity of the paper surface is controlled by a coating colour comprising a combination of binder and coating pigments.
  • the coating colour comprises 75 to 95 percent by weight of coating pigments.
  • the coating pigment can be incorporated into a dispersion, and may appear as a composition, in which the coating pigments constitute 50 to 100 percent by weight of said composition.
  • the bonding agent constitutes 5 to 25 percent by weight of the total coating colour.
  • the bonding agent can be added in form of a solution, and may appear as a composition, in which the bonding agent constitutes 10 to 100 percent by weight.
  • any suitable bonding agent and coating pigment may be used.
  • admixing materials that are suitable and known per se within the field may be added to the coating colour.
  • the mixture may comprise 0 to 10 percent by weight of admixing materials.
  • the paper is calendered, preferably after surface treatment.
  • suitable fiber-based base paper is used as so-called base paper [stock]
  • printing paper according to the invention can be created, e.g., Light Weight Coated (LWC), Medium Weight Coated (MWC), Machine Finished Coated (MFC), Wood Free Coated (WFC) paper, or similar paper.
  • LWC Light Weight Coated
  • MWC Medium Weight Coated
  • MFC Machine Finished Coated
  • WFC Wood Free Coated
  • filler materials, coating pigments, bonding agents and/or other chemicals are added to the fiber furnish in the paper production process. Any substances or chemicals known in the field may be used as filler materials, coating pigments, bonding agents and chemicals.
  • the coating colour comprised in the paper according to the present invention preferably comprises a coating pigment with such particle size distribution that at least 40% by weight of the coating pigment particles are smaller than 2 ⁇ m, at least 25% by weight of the coating pigment particles are smaller than 1 ⁇ m, and 10% by weight of the coating pigment particles are smaller than 0.5 ⁇ m.
  • Particle size means to be the equivalent spherical diameter determined by a sedimentation technique (measured by using Sedigraph 5100).
  • the substrate is surface treated with multi-layer treatment; the substrate can be double- or multi-coated. According to a preferred embodiment it is sufficient that only one of the two or more surface treatment layers have the desired low porosity.
  • the substrate is surface treated by coating and/or surface sizing and the substrate is coated or surface sized with at least two layers one upon the other. According to a preferred embodiment of the invention the lowest layer adjacent to the substrate is coated.
  • the substrate is surface treated by pre-coating the one or both surfaces of the substrate.
  • the substrate is pre-coated with dense pre-coating.
  • the substrate is further coated with at least one more coating layer, which may be dense or not.
  • the dense surface treatment layer can be any of the two or more surface treatment layers. According to one embodiment the dense layer is the uppermost surface treatment layer. According to another embodiment the dense layer is the intermediate surface treatment layer. According to another embodiment the uppermost surface treatment layer is not the dense layer, which enables a possibility to arrange, for example, better printability to the uppermost surface treatment layer.
  • the thickness of the at least one dense surface treatment layer is 1 to 14 gsm (grams per square meter) per one side of the substrate, preferably between 7 to 14 gsm per one side. According to one embodiment the total coating thickness is 7 to 40 gsm per side.
  • the heat set offset printing process as described and claimed herein makes use of the printing inks and substrate as set out within this description.
  • the process according to the present invention runs perfectly stable.
  • the final product has a superior gloss and smoothness besides the desired AFT value.
  • the mineral oil solvents used in this invention are characterized by the boiling ranges, the aromatic contents and the aniline points.
  • the boiling or distillation range [in ° C.] is determined by distillation according to DIN ISO 3405 or ASTM D 86. The initial and the final boiling points determine the boiling range.
  • the aniline point [in ° C.] describes the solubility power of a solvent and is determined by DIN ISO 2977 or ASTM D 611.
  • the aromatic content [in wt %] is determined by ASTM D 2140 or EC-A-A07 (UV).
  • the Hydrocarbon type analysis is done by DIN 51378 and determines the content of aromatics (Car), naphthenics (Cn) and paraffinics (Cp) [in %].
  • Carbon-type composition distillation range Aniline point (DIN 51378, (DIN ISO 3405, (DIN ISO 2977, ASTM D 2140) Component ASTM D 86) ASTM D 611), Car Cn Cp Mineral oil A 280-310° C. 82 12 22 66 Mineral oil B 240-270° C. 84 ⁇ 1 25 74 Mineral oil C 210-230° C. 84 ⁇ 1 ⁇ 1 99 Mineral oil D 240-270° C. 72 12 22 66
  • the cloudpoint temperature is a characteristic property, which is defined as the temperature at which a liquid (solution of a solid material and a solvent) begins to become cloudy.
  • the solubility or compatibility of resins and varnishes is determined by cloud point measurements using a Chemotronic® device (Novomatics GmbH/Germany).
  • the present invention refers to the use of varnishes and printing inks as defined herein within a heat-set offset printing process.
  • the varnishes further comprise vegetable oil, preferably stand oil.
  • the varnishes preferably comprise a mixture of a main resin and a co-resin.
  • the main resin is a self structured phenolic modified rosin resin with a viscosity of 30 Pas (35% in 6/9 AR blend*) and good compatibility (cloud point: 120° C. (in 6/9 AF new*).
  • self structured resins have non Newtonian flow behaviour.
  • a skilled person can determine the structure of a resin by viscosity measurements on a rotational viscometer using p-Ostwald method.
  • Standard Newtonian resins have a p-Ostwald factor of 0.9 to 1.0.
  • Self structured resins have a p-Ostwald factor of 0.6 to 0.8.
  • Examples for preferred self-structured phenolic modified rosin resins according to the present invention are e.g. Cray Valley Tergraf UZ87, Hexion Setaprint P7950, Arez PM1235.
  • the co-resin is a hydrocarbon resin with a viscosity of 40 Pas (55% in 6/9*) and very good compatibility (Cloud point: 110° C. (in 6/9 AF*).
  • hydrocarbon resins according to the present invention are e.g. Neville Nevprint LG or Resinall R260.
  • the printing ink composition comprises a pigment paste in amounts of between 1% and 60% by weight, preferably between 25% and 50% by weight and most preferably between 30% and 45% by weight.
  • the varnishes are present within the non-fluting heat-set printing ink composition described herein in amounts of between 15% by weight and 50% by weight, preferably 15% by weight to 30% by weight, based on the printing ink composition.
  • Resins used in offset technique are characterized by their solubility (Cloud point) and viscosity of the resin in a mineral oil distillate solution. These solutions can be prepared in Thermotronic® (Novomatics GmbH/Germany) varnish mixer. Depending on resin type, mixtures are made containing between 35% by weight and 55% by weight of hard resin and 45% by weight to 65% by weight mineral oil distillate with aromatic content adjusted to resin solubility (Testoils e.g.: DOW/Haltermann PKWF 6/9, 6/9AF, 6/9AFnew, 6/9AR, 6/9AR blend). Resin solution viscosities are determined by a rotational viscometer using a cone (25 mm diameter) and a plate at 23° C. The gap between cone and plate must be 0.05 mm. The viscosity is measured at a shear rate of 25 s ⁇ 1 .
  • the varnish comprises a mineral oil with a low boiling range of from 240 to 270° C. (one part with an aromatic content of 15%, the other part with an aromatic content of 1%; the mixture is used to get a final aromatic content of 8%). It comprises vegetable stand oil.
  • the main resin is a self structured phenolic modified rosin resin with a viscosity of 30 Pas (35% in 6/9 AR blend*)) and good compatibility (Cloud point: 120° C. (in 6/9 AF new*)).
  • the co-resin is a hydrocarbon resin with a viscosity of 40 Pas (55% in 619*) and very good compatibility (Cloud point: 110° C. (in 6/9 AF*)).
  • the resins are diluted in solvent and additives, heated to 180° C. and stirred for 30 min. After rheology and tack of the varnish was checked the varnish was cooled down to 130° C. and discharged.
  • the resins are diluted in solvents and additives, heated to 180° C. and stirred for 30 min. After rheology and tack of the varnish were checked the varnish was cooled down to 130° C. and discharged.
  • the resins are diluted in solvent and additives, heated to 160° C. and stirred for 30 min. Then the gelling agent (diluted in solvent) was added and stirred for further 30 min. After rheology and tack of the varnish were checked the varnish was cooled down to 130° C. and discharged.
  • This varnish comprises a mineral oil with a low boiling range of from 240 to 270° C. (aromatic content 15%), vegetable oil (wood oil) and a plasticizer (Di-Acid-diEster).
  • the main resin in the varnish has low viscosity (30 Pas; 45% in 6/9AR blend*) and good compatibility (Cloud point: 135° C.; 10% in 6/9AF*).
  • the co-resin has medium viscosity (35 Pas; 40% in 6/9AR*), medium compatibility (Cloud point: 115° C.; 10% in 619*) and gel reactivity.
  • the varnish is gelled with an aluminium chelate complex.
  • the resins are diluted in solvent and additives, heated to 175° C. and stirred for 30 min. Then the varnish was cooled down to 160° C. and the gelling agent (diluted in solvent) was added and stirred for further 30 min. After rheology and tack of the varnish were checked the varnish was cooled down to 130° C. and discharged.
  • Example 1 The varnishes as described in Example 1 are suited to prepare non-fluting heat-set printing ink compositions, some of which compositions are described in the following Examples:
  • Series 14000D printing ink is based on varnish 7131.
  • the printing ink composition was made of pigment paste (pigment level 30%).
  • a high pigment level allows thin printing ink films on printing press, which speeds up drying of the printing inks. For improved rub resistance and good coating colour of the paper sheets PE and PTFE wax pastes were added.
  • the components of the printing ink were mixed in a dissolver at temperatures up to 60° C.
  • Series 14000T printing ink is based on varnish 7131.
  • the components of the printing ink were mixed in a dissolver at temperatures up to 60° C.
  • Series 15000 is based on varnish 7131 and on the “4/7 varnish”.
  • the components of the printing ink were mixed in a dissolver at temperatures up to 60° C.
  • the components of the printing ink were mixed in a dissolver at temperatures up to 60° C.
  • AFT values for different known papers and printing inks printed thereon are shown.
  • the printing ink used for all AFT measurements described in the table below is SunChemical “Challenge Intensive”.
  • the web exit for all measurements is 130° C.
  • Respective trials with printing inks as described herein printed on the paper according to this invention show the desired non-fluting behaviour of the resulting printed substrate/paper, i.e. AFT values are below 0.05%.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Printing Methods (AREA)
  • Laminated Bodies (AREA)
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US20100132902A1 (en) 2010-06-03
EP2142701A1 (en) 2010-01-13
CN104131488A (zh) 2014-11-05
FI20075286A (sv) 2008-10-26
FI20075286A0 (sv) 2007-04-25
CN101680187A (zh) 2010-03-24
US8268130B2 (en) 2012-09-18
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US20100112243A1 (en) 2010-05-06
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JP2010525129A (ja) 2010-07-22
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US8277611B2 (en) 2012-10-02
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US20100083858A1 (en) 2010-04-08

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